Initial commit: img-infinite-canvas AI design workbench MVP

Moteva-style AI design workbench replica. Home prompt creates a project;
the project page provides an infinite canvas with node drag, zoom/pan,
a design chat panel, history replay, image asset upload, and project
save/regenerate.

- Backend: go-zero, DDD layering, sqlc/pgx, optional PostgreSQL; memory
  or Redis cache; asynq job queue; MinIO/S3/R2/OSS object storage;
  sky-valley/pi agent runtime adapter.
- Frontend: Next.js App Router + Vite artifact build, TypeScript, i18n,
  shadcn/ui components, auth (OTP/Turnstile/Google/WeChat).
- Deploy: Docker Compose and k3s manifests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/application/project_title_test.go

@@ -0,0 +1,57 @@
+package application
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"img_infinite_canvas/internal/domain/design"
+	"img_infinite_canvas/internal/infrastructure/memory"
+)
+
+func TestUpdateProjectTitlePersistsTrimmedTitle(t *testing.T) {
+	ctx := context.Background()
+	repo := memory.NewProjectRepository()
+	service := NewDesignService(repo, nil, nil, nil, nil)
+	createdAt := time.Date(2026, 7, 5, 12, 0, 0, 0, time.UTC)
+	service.now = func() time.Time { return createdAt.Add(time.Minute) }
+	project := design.Project{
+		ID:        "project-title",
+		Title:     "Old title",
+		Brief:     "brief",
+		Status:    design.StatusReady,
+		UpdatedAt: createdAt,
+	}
+	if err := repo.Save(ctx, project); err != nil {
+		t.Fatal(err)
+	}
+
+	renamed, err := service.UpdateProjectTitle(ctx, project.ID, "  New canvas name  ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if renamed.Title != "New canvas name" {
+		t.Fatalf("unexpected title: %s", renamed.Title)
+	}
+	if !renamed.UpdatedAt.After(createdAt) {
+		t.Fatalf("expected updated timestamp to advance, got %s", renamed.UpdatedAt)
+	}
+
+	stored, err := repo.Get(ctx, project.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if stored.Title != renamed.Title {
+		t.Fatalf("stored title mismatch: %s", stored.Title)
+	}
+}
+
+func TestUpdateProjectTitleRejectsBlankTitle(t *testing.T) {
+	ctx := context.Background()
+	repo := memory.NewProjectRepository()
+	service := NewDesignService(repo, nil, nil, nil, nil)
+	if _, err := service.UpdateProjectTitle(ctx, "project-title", "   "); !errors.Is(err, design.ErrInvalidInput) {
+		t.Fatalf("expected invalid input, got %v", err)
+	}
+}